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Патент USA US3053047

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Sept. 11, 1962
H. BURR
3,053,037
APPARATUS AND PROCESS FOR INSULATING AND TWISTING STRANDS
Filed Jan. 24, 1961
(£1
INVENTOR.
HARVEY BURR
States Patent 0 free
1
2
3 053,037
APPARATUS AND PI’QOCESS FOR INSULATING
AND TWISTING STRANDS
3,053,637
Patented Sept. 11, 1962
.
Harvey Burr, Hastings on Hudson, N.Y., asslgnor to
Anaconda Wire and Cable Company
Filed Jan. 24, 1961, Ser. No. 84,692
8 Claims. (Cl. 57-12)
My invention relates to the application of wrapped
strands together. In addition to the foregoing, my ap
paratus comprises supply stations each supplying a strip
of covering material for one of the strands. The supply
stations are ?xed at points out of the path of'advance of
the strands and the apparatus comprises a plurality of
wrapping dies each directing one of the strips to one of
the strands at a point upstream of the forming die. The
strips are wrapped around the strands in consequence of
the twisting of the strands around their own axes by the
tapes or servings to elongated strands and particularly to 10 twisting means. Advantageously the wrapping dies may
apparatus and process for the combined wrapping of the
be heated such as by electrical resistance units to ease
individual strands and twisting of pairs for telephone
the passage of the strip through the die, and the forward
motion of the strands controlled by gear means between
the twisting means and the advancing means.
narrow tapes of insulating material are wrapped around 15
A feature of one embodiment of my invention com
copper wires to produce insulated conductors. Tape
prises an endless belt to advance the strips as they wrap
winding machines are customarily used for this opera
around the strand. The belt is in frictional contact with
the strips and may be faced by an opposing belt or by a.
tion and the insulated conductors are taken up on reels
cables.
In the manufacture of strip-insulated telephone cables
in the tape winding machines for storage and further
processing. Since telephone cables are most commonly
made up of twisted pairs each consisting of two insulated
conductors twisted together with a predetermined length
of lay, the next major operation in the manufacture of a
telephone cable after the conductor wires have been
polished plate. The belt is driven at a speed which is
a function of the speed of the strand and preferably my
apparatus comprises means for changing the ratio of
the belt speed to the strand speed.
My invention emcompasses the process for continuous
ly covering and twisting together a plurality of strands
wrapped with insulating tape is usually the twisting of 25 by paying them into a common forming die from sta~
tionary supply stations and twisting them by applying a
two of the insulated wires to form a twisted pair. For
this purpose the reels of insulated conductor are removed
to another machine known variously as a twister, a twin
ner, or a strander. In the twister two individually in~
sulated wires are spiralled together to form a twisted 30
pair, and the product supplied by a twister will consist
twist downstream of the forming die.
In my process,
strips of covering material are payed off from supply
stations ?xed relative to the paths of the strands, each
strip extending to one of the strands at a point upstream
of the forming die where the strands are still separated
from each other. The strips are advantageously heated
at the points of application to the strands and wrap around
the strands in consequence of the twisting of the strands
of a reel or of some other form of package containing
va single continuous length of the twisted pair so formed.
In a later step in the manufacture of a telephone cable,
this, along with other reels of twisted pair will be re 35 on their own axes when they are twisted together.
moved to a cabling machine where the pairs will be
Other objects of my invention will be made obvious
twisted with other pairs to form a cable core. From the
foregoing it will be seen that the manufacture of a twisted
from the drawing and detailed description as follows.
In the drawing:
pair by known methods requires two different operations.
FIG. 1 is a schematic plan view of an embodiment
These operations are the wrapping of strip insulation 40 of the apparatus of my invention.
onto wires and the twisting of the insulated wires into
FIgIG. 2 is a schematic side view of the apparatus of
pairs.
Manufacturing operations in which elongated strands
. 1.
FIG. 3 is a plan view of one embodiment of a feature
of myvinvention.
are ?rst wrapped or served with a covering material and
FIG. 4 is an elevation of another embodiment of the
then twisted together are not, however, limited to the 45
feature of FIG. 3.
telephone cable art or to the wire and cable industry,
and my invention is not to be construed as being so lim
A combined taping and twisting apparatus indicated
ited.
generally at 9 in FIGS. 1 and 2 is mounted on a frame
or platform 10. A twisting unit 11 has'a frame 12 sup
It is an object of the apparatus of my invention to
combine the two operations of wrapping a covering ma 50 ported on journals 13, 14 and driven through a belt 15
by means of the motor 16. A_ plurality of strands 17, 18
terial onto an elongated strand and twisting two or more
pass over the entrance sheave 19, which is ?xed to the
strands together, into a single operation.
It is a further object of the apparatus of my invention
to apply a wrapped covering to elongated strand in such
a ‘manner that the covering will not burst during subse
quent twisting of the strands.
I achieve these objectives with apparatus that com
bines the operation of wrapping insulation onto indi
vidual Wires and twisting said insulated wires together.
My apparatus comprises means for advancing a plurality
of strands along spaced paths at a predetermined speed.
It also comprises a forming die for bringing the strands
together at the end of their spaced paths and twisting
means, downstream of the forming die, for twisting the 65
frame 12 of the twisting unit 11 and rotates with the
frame 12 to impart a twist to the strands 17, 18 and thus
form a twisted pair 21. The plurality of strands 17, '18
are not necessarily limited to two, and in those cases
where more than two strands are twisted the cable core
formed will be larger than the twisted pair 21.
In the particular type of twisting unit 11 shown in the
drawing
a take-up reel 22 rotates on a stationary axis
‘
while the frame 12, entrance sheave 19, and three addi
tional guide sheaves 23, 24, 25 rotate around it. Artwist
i-ng unit of the type shown imparts two complete twists
to the strands for each revolution of the frame 12, and
is preferred when this invention is used in the manufac~
3,053,037
3
4
ture of paper-insulated telephone cable pairs. Other
forms of twisting mechanisms, particularly forms in which
to each of the individual uncombined strands by virtue
of the rotation imparted to them by the operation of
stranding or twisting a number of strands together.
In one embodiment of my invention, particularly suited
the axis of the reel 22 is perpendicular to the axis of the
?ame 12, as in the illustrated case, or in which the axis
of reel 22 is parallel to the axis of the frame 12 might be
employed without lessening the usefulnes or novelty con
tributed by this invention. Some of these alternative
forms impart only one twist to the strands rather than
for use with paper tape insulation, an upper endless belt
61 is placed in contact with the upper surface of the
strands 17, 18 and a lower endless belt 62 is in contact
with the under surfaces of the strands 17, 18. The belts
the double twist imparted by the preferred form of the
61, ‘62 are preferably made from rubberized fabric and
twisting unit 11. In the twisting unit 11 the twisted pair 10 are driven, both at the same linear speed, by means of a
21 passes over the sheaves 23, 24 and 25 through a tra
verse guide 26 onto the reel 22. Sheave 25 since it is ro
tating relative to reel 22 imparts an additional twist to the
variable speed gear 63 and bevel gears 64, 65 from the
drive shaft 38. By means of the variable speed gear 63
the speed of the belts 61, 642 can be varied at will. In
twisted pair 21.
addition the endless belts 61, 62 can be rotated about a
The strands 17, 18 are supplied from stationary and 15 vertical axis to vary the angle bet-ween the axis of motion
non-rotating reels 31, 32 through guide sleeves 33, 34 to
of the belts and the axis of motion of the strands 17, 18.
a grooved double-pulley pay-0E capstan 35. The reels
FIGS. 3 and 4 show one embodiment of an assembly
31, 32 are stationary in the sense that they have no plane
for the upper endless belt 61 and show details of the
tary motion about the axis of advance of the strands 17,
mounting of the belts that have been omitted from FIGS.
18 and they are non-rotating in the embodiment shown 20 1 and 2 for the sake of clarity. The assembly of the lower
endless belt 62 is analogous. The belt 61 is mounted over
in the drawing in the sense that the strands 17, 18 are
?ipped over the ?anges of the reel rather than turning the
rolls 66, 67 rotatably ?xed in support 68. Roll 66 is
driven through an extension of its shaft 69 terminating
reels 31, 32 on their axes. However, apparatus wherein
the strands are payed from rotating reels on axes sta
in a clevis 70 which forms a part of the telescopic univer~
tionary with reference to the path of advancement of the 25 sal joint 71.
The support 68 has a vertical stub shaft 72 rotatably
strands, will also be included within the scope of my in
mounted in a bearing 73. The bearing is adjustably
vention. Other strand pay-off means are known, and the
scope of this invention is not ‘limited to the pay-off reel
mounted in angular relation to the axes of the strands 17,
arrangement shown in the drawing.
18 by means of the arm 74 which is, in turn, rigidly fas
The speed of the capstan 35 determines the speed of 30 tened as by welding to a post 75 vertically mounted on
the forward motion of the strands 17, 18, consequently,
the platform 10, a collar 76 locked to the stub shaft 72
when the rotational speed of the frame 12 remains con
stant the length of lay of the twist in the twisted pair 21
will depend on the speed of the capstan 35. The capstan
35 is driven by the motor 16 through change gears 36 and 35
37, shaft 38, bevel gears 41, 42 and a shaft 43. After
by a set screw 77 prevents the stub shaft 72 from drop
ping out of the bearing 73. Another set screw 78 locks
the stub shaft 72 in a ?xed angular position in the bear
ing 73.
Since the strands 17, 18 are rotating at the same time
leaving the capstan 35, strands 17, 18 pass around vertical
as they are moving forward, any point on the upper sur~
guide rolls I44, 45 and through a lay plate 46. The lay
face of one of the strands 17, 18 will have a resultant mo
plate 46 keeps the strands 17, 18 separated and they pass
tion at an angle to the axis of forward motion of the
40 strands. A pointer 79, parallel to the axis of motion of
from the lay plate 46 into a forming die 47.
When the frame 12 rotates it imparts torsion to each
the upper belt 61 in conjunction with an arcuate scale 80
of the strands 17, =18. This torsion carries back through
shown diagrammatically in FIG. 3 can be used to adjust
the lay plate 46 twisting each of the strands 17, 18 around
the angle of motion of the belt 61 to coincide with the
its own axis. Pads 48, 48a of strip insulation are shown
angle of motion of points on the upper surface of the
schematically in the drawing to be rotatable about pins 49,
strands 17, 18. The scale 80 is mounted to the platform
50 but the pads 48, 48a are stationary in the sense that
10 between two vertical posts 81, 82. In like manner
they do not have any planetary motion around the path
the angle of motion of the endless belt 62 can be adjusted
of advancement of the strands 17, 18. Paper is com
to the motion of points on the lower surface of the strands
monly used for telephone cable pairs but tapes of a plas
17, 18. The belts '61, 62 may be wide enough to cover
tic material such as polyethylene may be applied, or a
a plurality of the strands 17, 18 feeding into the twister
plurality of ends of textile material such as combed cotton
yarn. A tape ‘51 is applied to the strand 17 from the pad
48 through a die 53 and another‘ tape 52 is applied to the
strand 18 from the pad 48a through a die 54. As the
strands 17 and 18 pass through the lay plate 46 they carry
the tapes 51, 52, forward with them. The dies 53, 54 may
be heated through leads 55 from an electrical power
source 56.
11 or individual belts may be applied to each strand.
When the belts 61, 62 are used they are applied to the
taped strands 17, 18 after they leave the dies 53, 54.
The speed and angle of the belts 61, 62 are adjusted to
cause the tapes 51, 52 to advance faster than the strands
17, 18 so that the tapes are applied loosely on the strand.
(This can be done readily when the tape has a degree
of stiifness such as is characteristic of paper. For softer
The tape 51 is wrapped around the strand 17 due to
tapes such as polyethylene, however, I prefer to omit
the back twist in the strand resulting from the rotation of 60 the belts 61, 62.) Such loosely applied tape covering
frame 12. Similarl;r the tape 52 is wrapped around the
will not rupture in passing over sheaves 19‘, 23, 24, 25,
strand 18. No tape winding equipment is required to
and in receiving the additional twist imparted between
wrap the insulating strip around the individual strands and
the sheave 25 and the reel 22 as heretofore noted.
the insulated strands advance directly into the twister
In an alternative embodiment of the belt feature of
without intermediate steps of winding onto reels and un
my invention, shown in FIG. 4, the lower belt has been
winding therefrom which intermediate Workings would
supplanted by a polished plate 83 having a ledge 84.
have a hardening effect on the wire and could not help but
disarrange to some degree the evenness of the tape wrap
The ledge 84 may also have the form of a shallow groove
in the surface of the plate 83 and prevents the wire 18
pings.
from being pushed to the right by the motion of the
It has been known to separate the forming die 47 a con 70 belt 61.
siderable distance from the twister 11 and then to take
It is an advantage of my invention that the tape
advantage of the rotation of the twisted pair or core to
supply pads 48, 48a are ?xedly mounted and do not
wrap tape over the combined strands at a point between
rotate around the wires 17, 18. It has been known
the die '47 and the entrance to the twister 11. A novel
that the taping and twisting operations might be com
feature of my invention resides in the application of tape 75 bined by rotating the tape supply pads around the wires
3,053,037
5
entering the twister but such apparatus would be compli
cated and expensive. My discovery that tape can be
supplied from pads on stationary axes into ‘the individual
wires paying into a twister has had the bene?cial effect
of eliminating the need for additional rotating equipment.
I claim:
1. Apparatus for individually covering and twisting
strand upstream of said forming die, at'least one end?
less belt in frictional contact with said strips downstream
of the location where said strips are wrapped around
said strand, said belt advancing said strips and said
strips being wrapped around said strands in consequence
of the twisting of said strands on their axes by said
twisting means.
together a plurality of strands comprising means for
5. Apparatus for individually covering and twisting
advancing said strands along spaced paths at a prede
together a plurality of strands comprising means for
termined speed, a forming die located at the end of 10 advancing said strands along spaced paths at a pre
said paths ‘for bringing together said strands, twisting
determined speed, a ‘forming die located at the end of
means downstream of said forming die for twisting
said paths for bringing together said strands, twisting
together said strands, a plurality of supply stations
means downstream of said forming die for twisting to
each supplying a strip of covering material for one of
gether said strands, a plurality of supply stations each
said strands, said supply stations being each at a point 15 supplying a strip of covering material for one of said
out of the paths of advance of said strands, a plurality
strands, said supply stations being each ?xed at a point
of wrapping dies in the spaced paths of said strands,
out of the paths of advance of said strands, a plurality
each of said wrapping dies directing one of said strips
of wrapping dies in the spaced paths of said strands,
each of said wrapping dies directing one of said strips
to one ‘of said strands at a location on the path of said
strand upstream of said forming die, said strips being
to one of said strands at a location on the path of said
wrapped around said strands in consequence of the
twisting of said strands on their axes by said twisting
strand upstream of said ‘forming die, two endless belts
in frictional contact with said strips downstream of the
means.
_
'
2. Apparatus for individually covering and twisting
location where said strips are wrapped around said
strand, means for driving said belts in proportion to the
together a plurality of strands comprising means for 25 speed of advancement of said strands, variable speed
control means for changing said proportion, said belts
advancing said strands along spaced paths at a prede
being adjustably mounted on an axis normal to the axis
termined speed, a forming die located at the e11_d_of
of said strands on opposite sides thereof and forming
said paths for bringing together said strands, twisting
angles with said strand of equal degree but of opposite
means down-stream of said forming die for twisting
together said strands, a plurality of supply stations each
supplying a strip of covering material for one of said
strands, said supply stations being each ?xed at a point
out of the paths of advance of said strands, a plurality
of wrapping dies in the spaced paths of said‘strands,
each of said wrapping dies directing one of said strips
to one of said strands at a location on the path of said
strand upstream of said forming die, means for heating
said wrapping dies, said strips being wrapped around
said strand in consequence of the twisting of said strands
on their axes by said twisting means.
3. Apparatus for individually covering and twisting
together a plurality of strands comprising means for
advancing said strands along spaced paths at a prede
termined speed, a ‘forming die located at the er1_d_of
said paths for bringing together said strands, twisting
means downstream of said forming die for twisting to
gether said strands, gear means connecting said advanc
sign, said belts advancing said strips and said strips
being wrapped around said strands in consequence of
the twisting of said strands on their axes by said twist
ing means.
6. Apparatus for individually covering and twisting to
gether a plurality of strands comprising means for ad
vancing said strands along spaced paths at a predeter
mined speed, a forming die located at the end of said
paths ‘for bringing together said strands, twisting means
downstream of said forming die ‘for twisting together said
40 strands, a plurality of supply stations each supplying a
strip of covering material for one of said strands, said
supply stations being each ?xed at a point out of the paths
of advance of said strands, a plurality of wrapping dies
in the spaced paths of said strands, each of said wrapping
dies directing one of said strips to one of said strands
at a location on the path of said strand upstream of said
forming die, an endless belt in frictional contact with said
strips downstream of the location where said strips are
ing means to said twisting means whereby said strands
will be caused to advance at a preselected distance for 50 wrapped around said strands, means for driving said belt
at a speed proportional to» the speed of advancement of
each revolution of said twisting means, a plurality of
said strand, a smooth plate disposed on the opposite side
supply stations each supplying a strip of covering ma
of said strands from said belt, said belt constraining said
terial for one of said strands, said supply stations be
strands against said plate, said belt advancing said strips
ing each ?xed at a point out of the paths of advance of
said strands, a plurality of wrapping dies in the spaced 55 and said strips being wrapped around said strands in con
sequence of the twisting of said strands on their axes by
paths of said strands, each of said wrapping dies direct
ing one of said strips to one of said strands at a loca
tion in the path of said strand upstream of said form
ing die, said strips being wrapped around said strands
said twisting means.
.
7. The process of covering and twisting together a plu
rality of strands in one continuous operation comprising
paying o? a plurality of said strands each from a sta
in consequence of the twisting of said strands on their 60 tionary supply station into a common forming die, twist
aXes by said twisting means.
ing together said strands at said die by applying the twist
4. Apparatus for individually covering and twistini
together a plurality of strands comprising means for
advancing said ‘strands along spaced paths at a prede
downstream of said die, paying off a plurality of strips of
covering material from supply stations ?xed relative to
the paths of said strands, each of said strips extending
termined speed, a forming die located at the end of 65 from one of said supply stations to one or said strands
said paths for bringing together said strands, twisting
at a point upstream of said forming die, said strands being
means downstream of said forming die for twisting to
separated from each other at said point, said strips form
gether said strands, a plurality of supply stations each
ing spiral wraps 1around the respective individual strands
supplying a strip of covering material for one of said
70 by reason of the twisting around their own axes of said
strands, said supply stations being each ?xed at a point
strands imparted by said twisting together of the‘ strands.
out of the paths of advance of said strands, a plurality
8. The process of covering and twisting together a plu
of wrapping dies in the spaced paths of said strands,
rality of strands in one continuous operation comprising
each of said wrapping dies directing one of said strips
paying off a plurality of said strands each from a sta
to one of said strands at a location on the path of said 75 tionary supply station into a common forming die, twist
3,053,037
8
ing together said strands at said die by applying a twist
of said strands on their own axes by said twisting together
downstream of said die, paying o? a plurality of strips
of the strands.
of insulating material from supply stations ?xed at a
point out of the paths of said strands, each of said
References Cited in the ?le of this Patent
strips extending from one of said supply stations to one 5
UNITED STATES PATENTS
of said strands at a point upstream of said forming die,
said strands being separated from each other at said point,
2 347 631
2:947:652
Hotchkiss ____________ __ APR 25, 1944
Bun. _________________ __ Aug. 2’ 1960
1,072,160
Germany ____________ __ Dec. 24, 1959
heating said strips at the points of application to said
strands, said strips forming spiral wraps around the re
spective individual strands in consequence of the twisting 10
FOREIGN PATENTS
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